[Haskell-beginners] "Shortcut" for f (g x) (g x)

[Dániel Arató]

Hi!

I think you're looking for Data.Function.on:
http://hackage.haskell.org/package/base-4.10.0.0/docs/Data-Function.html#v:on

On 04/12/2017, Baa <aquagnu at gmail.com> wrote:
> Hello, All!
>
> Does Haskell have some "short-form" for such call: `f (g x) (g x)`, for
> example:
>
>   compare (snd x) (snd x)
>
> Looks like combinatory logic or `ap` but not exactly...
>
> ===
> Best regards, Paul
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